Showing white box in youtube embeds in lightbox?

Hi

I am not sure why is display white box in youtube embeds in media galley when using lightbox in the media gallery

here a screenshot
Spoiler


the white box is not displaying when you view the media overview page and displaying the embeds as normal

also I have installed s9e/MediaSites add-on and I have disabled all add-ons except XenForo media gallery as I am not sure why is it displaying
white box in lightbox

Does anyone known how to fix the issue?

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